Identification of Additional Habitats of Nectria haematococca Mating Population VI

Abstract

Isolates (152) of Fusarium solani were tested for ability to cross with 2 hermaphroditic isolates of opposite mating type of N. haematococca mating population VI. Of the 44 isolates which produced a fertile cross, 21 were obtained from diseased pea and at least 2 isolates were obtained from diseased parts of each of the following plants: chickpea, potato, tulip tree, alfalfa, cottonwood and sainfoin. Most of the isolates identified as members of mating population VI were tested for virulence on pea. In general, the most virulent isolates on pea originally had been isolated from pea. Several of the isolates obtained from habitats other than pea were as virulent as or more virulent than some of those from pea. Isolates of N. haematococca mating population VI pathogenic on pea can be found in a variety of habitats.